CN101737181A - Method of calculating mass fraction burnt in an internal combustion engine based on rassweiler-withrow method for real-time applications - Google Patents

Abstract

A system and method for determining mass fraction burned in an internal combustion engine includes a plurality of engine sensors and a control module determining a ratio of specific heat from a combination of one or more from the group of exhaust gas temperature, injected fuel quantity, air quantity inside a cylinder, mass air flow, air fuel ratio, manifold pressure and a residual gas amount determined from the plurality of engine sensors. The control module includes a mass fraction burned module determining a mass fraction burned in response to a cylinder volume, and the ratio of specific heat. The control module controls an engine parameter based on mass fraction burned.

Description

That uses in real time calculates the method for having fired mass fraction in the internal-combustion engine based on the RASSWEILER-WITHROW method

Technical field

The present invention relates to vehicle control system, relate in particular to the vehicle control system that is used for according to firing mass fraction control motor.

Background technique

Here it is to be used for totally presenting background of the present disclosure that the background technique that provides is described.

Describe inventor's the work of the current signature of scope with regard to the background portion branch, and the prior art that yet impliedly is not counted as present disclosure had not both been expressed in the description that limits as prior art when submitting to.

The calculating of firing mass fraction for internal-combustion engine is the index of release heat ratio when motor charges into mixed gas (i.e. inflation) in specific cylinder events burning.This result calculated can be used as burning phasing, rate of heat release, inflation is diluted or other are used for measuring of engine control.Also have other methods to be used for calculating the mass fraction that internal-combustion engine burns.These methods are not that calculation of complex is exactly the precision that is not enough to be used in the engine control purpose.The Rassweiler-Withrow method is a kind of the most effective equation that the representation of point-device inflation heat release is provided.Though accurate more equation is arranged, and assessing the cost of those equations is very high.Yet formula comprises the exponential term that its power changes in each engine cycles.Because this exponential term repeats to be calculated an engine cycles, be the high operation that assesses the cost therefore for real-time application.

Summary of the invention

The invention provides a kind of simplification has fired mass fraction and has calculated the method remain on simultaneously in the required accurate scope of engine control operation.

In one aspect of the invention, a kind of method comprises by determining that according to the one or more combination in the group of air quantity, Mass Air Flow, air fuel ratio, mainfold presure and residual volume in exhaust gas temperature, fuel injection amount, the cylinder expression of residual air capacity in mixture temperature, air fuel ratio and the cylinder determines ratio of specific heat, according to volume of cylinder, mixture temperature, air fuel ratio and mainfold presure and described ratio of specific heat determine to have fired mass fraction, and according to having fired mass fraction control engine parameter.

In another aspect of this invention, a kind of method comprises that forming chart according to two inputs from two-dimensional diagram exports and form modifying factor, these two inputs are selected from the group by the air quantity in exhaust gas temperature, fuel injection amount, the cylinder, Mass Air Flow, air fuel ratio, mainfold presure and residual air capacity, and this modifying factor is not that its remainder of selecting to form described two inputs of this two-dimensional diagram is selected from this group.This method also comprises according to volume of cylinder, chart output and modifying factor determines to have fired mass fraction, and according to firing mass fraction control engine parameter.

In still another aspect of the invention, a kind of system comprises a plurality of engine sensors and control module, this control module is determined ratio of specific heat according to the one or more combination in a plurality of parameters of being determined by described a plurality of engine sensors, and described a plurality of parameters comprise air quantity, Mass Air Flow, air fuel ratio, mainfold presure and residual air capacity in exhaust gas temperature, fuel injection amount, the cylinder.Control module comprises according to volume of cylinder and the definite mass fraction of the combustion module of having fired mass fraction of ratio of specific heat.Control module is according to firing mass fraction control engine parameter.

The more areas that the present invention uses will become more apparent by hereinafter given detailed description.Should be appreciated that specific descriptions and specific examples only with laying down a definition and understanding purpose, still should not be used to limit the scope of the invention.

Description of drawings

To understand the present invention more completely by the detailed description and the accompanying drawings, in the accompanying drawings:

Fig. 1 is the Block Diagram according to engine control system of the present invention.

Fig. 2 is the figure of the relation of the variation between crankshaft angles and the volume under specific interval.

The figure of crankshaft angles (CA50) error and circuit relation when Fig. 3 is to use two or three Taylor series expansions.

Fig. 4 is the figure of crankshaft angles (CA50) error that exponential term is similar in the Rassweiler-Withrow method.

Fig. 5 is the detailed block diagram of control module among Fig. 1.

Fig. 6 is the detailed block diagram of firing the mass fraction module of Fig. 5.

Fig. 7 is first embodiment's of gamma module a detailed block diagram.

Fig. 8 is second embodiment's of gamma module a detailed block diagram.

Fig. 9 is the 3rd embodiment's of gamma module a detailed block diagram.

Figure 10 is used for determining to have fired mass fraction and this is responded the flow chart of controlling engine parameter.

Embodiment

Following being described in only is exemplary in essence, and is not intended to restriction the present invention, its application or use.For the sake of clarity, the identical drawing reference numeral of using in the accompanying drawing is represented similar element.Use at this, term " at least one among A, B and the C " should be understood that to represent to use the logic (A or B or C) of the logical "or" of nonexcludability.Be understood that the step in method can not change principle of the present invention with different order execution.

As used herein, term " module " refers to processor (shared processing device, application specific processor or processor group) and storage, the combinational logic circuit of specific integrated circuit (ASIC), electronic circuit, the one or more softwares of execution or firmware program and/or described functional other suitable components is provided.

With reference now to Fig. 1,, schematically shows the engine control system 10 of an example according to the present invention.Engine control system 10 comprises motor 12 and control module 14.Motor 12 also comprises intake manifold 15, has the fuel injection system 16 of fuel injector (not drawing especially), waste gas system 17 and pressurized machine 18.The motor 12 of example comprises that six cylinders 20 are disposed in the adjacent cylinder group 22,24 with the V-arrangement layout.Although Fig. 1 describes six cylinders (N=6), can understand that motor 12 also can comprise more or less cylinder 20.Give an example, the motor with 2,4,5,8,10,12 and 16 cylinders is estimated also can use.Also can expect to use and have the motor 12 that single-row cylinder arrangement is arranged.Although the internal-combustion engine that uses the no-spark igniting and do not have the ignition by compression of solar term is described, diesel engine for example, the present invention also can use on the internal-combustion engine that uses spark ignition.

In service at motor, the air inlet vacuum that the launched machine intake stroke of air produces sucks intake manifold 15.Air has sucked Indivudual cylinder 20 from intake manifold 15, is compressed at there then.The injected system 16 of fuel oil sprays into and and air mixing.In an example, controller 14 can with ejecting system 16 communications, thereby use pre-spray.For pre-spray, prior to the at first injected cylinder 20 that enters of a small amount of fuel oil of main charge, before spraying, the main charge of fuel will take fire just to wish priming volume, and therefore provide the quick igniting of main charge and do not had bigger delay.Air/fuel mixture is compressed, and the heat of compression and/or electric energy are lighted air/fuel mixture.Waste gas is discharged from cylinder 20 by flue gas leading 26.The turbine blade 25 of exhaust-driven turbocharger 18, turbine blade be Driven Compressor blade 25 successively again.Compressor blade 25 can transmit more air (supercharging) to intake manifold 15, enters cylinder 20 burnings then.

Turbosupercharger 18 can be any suitable turbosupercharger, for example but be not restricted to variable nozzle turbocharger (VNT).Turbosupercharger 18 can comprise a plurality of variable position fins 27, and it comes from the air quantity of vehicle exhaust pipe 17 to motor 12 according to the Signal Regulation that derives from control module 14.In more detail, fin 27 can move between fully open position and complete shut-down position.When fin 27 was in the complete shut-down position, the air that turbosupercharger 18 transmits maximum flow entered intake manifold 15, thereby enters motor 12.When fin 27 was positioned at fully open position, the air that turbosupercharger 18 transmits minimum flow entered motor 12.Transmit air quantity by between standard-sized sheet and complete shut-down position selectively positioning tabs 27 be conditioned.

Turbosupercharger 18 comprises automatically controlled fin solenoid valve 28, and it handles the flow of hydraulic fluid that flows to fin final controlling element (not shown).The position of fin final controlling element control fin 27.Sail position sensor 30 produces the sail position signal based on the physical location of fin 27.Pressurized sensor 31 produces boost pressure signal based on the additional air that turbosupercharger 18 is sent to intake manifold 15.Though the turbosupercharger of working here is described to VNT, can contemplates and use other turbosupercharger of different electronic control methods to be used.

Manifold absolute pressure sensor (MAP) 34 is positioned on the intake manifold 15, provides (MAP) signal based on the pressure in the intake manifold 15.Mass Air Flow (MAF) sensor 36 is positioned at air intlet, provides Mass Air Flow (MAF) signal based on the air quality that enters intake manifold 15.Control module 14 uses the MAF signal to determine to offer the air fuel ratio of motor 12.Crankshaft position sensor 44 provides the signal corresponding to crank position.Crankshaft position sensor 44 provides the relative position and the piston position that is connected on the bent axle of control module 14 bent axles.Crankshaft position sensor 44 also provides and is used to calculate engine speed signal.Manifold surface temperature sensor 46 produces intake air temperature signals.Control module 14 transmission injection timing signals are to ejecting system 16.Vehicle speed sensor 49 produces vehicle velocity signal.

Flue gas leading 26 can comprise exhaust gas recirculation (EGR) valve 50.Exhaust gas recirculation valve 50 can recirculation part waste gas.Controller 14 can be controlled EGR valve 50 and lead to realize needed EGR.

The overall operation of control module 14 control engine systems 10.Particularly, control module 14 is based on the operation of different parameters control engine system, and described parameter includes, but are not limited to, driver's input, stable control and similar parameters.Control module 14 can be provided as engine control module (ECM).

Control module 14 also can be regulated the operation of turbosupercharger 18 by the electric current that is adjusted to fin solenoid valve 28.According to embodiments of the invention, thereby control module 14 can provide the air stream (supercharging) of increase to intake manifold 15 with 28 communications of fin solenoid valve.

Exhaust gas temperature sensor 54 can provide the signal corresponding to exhaust gas temperature.The exhaust gas temperature signal can be transferred to control module 14.Abgassensor 56 can provide the signal corresponding to amount or the composition and the amount of waste gas or all gases in the exhaust manifold 26.The example of a suitable exhaust gas constituents signal is the waste gas lambda sensor.Certainly, the gas of other type, for example carbon monoxide, carbon dioxide, nitrogen oxide and hydrocarbon can be measured.

The invention provides the approximate mass fraction of combustion that goes in definite motor whole circulation of the Rassweiler-Withrow method that is widely known by the people.The Rassweiler-Withrow method is:

Wherein P is a cylinder pressure; V is a volume of cylinder, and it changes along with the crankshaft and piston angular orientation.

In above-mentioned formula, γ does not fix.Therefore, in order to find the mass fraction of combustion in each circulation, exponential term is calculated (U-L+1) in a whole process of circuit inferior.Yet because complexity of calculation, the index that has fractional power assesses the cost very high.

Following simplification is implemented and the validity of not losing overall algorithm:

Variable Δ V is defined by Δ V (θ _i)=V (θ _i)-V (θ _I-1).Fig. 2 illustrates

$\left(\frac{V\left({\mathrm{\θ}}_{i-1}\right)}{V\left({\mathrm{\θ}}_i\right)}\right)=\left(\frac{V\left({\∂}_i\right)-\mathrm{\ΔV}\left({\mathrm{\θ}}_i\right)}{V\left({\mathrm{\θ}}_i\right)}\right)=(1-\frac{\mathrm{\ΔV}\left({\mathrm{\θ}}_i\right)}{V\left({\mathrm{\θ}}_i\right)})---\left(2\right)$

Here 1 the write music Shaft angle number of degrees increment that has that is used for typical gasoline and diesel engine

Drawn.

As Fig. 2 finding,

Can not surpass 1, when writing music Shaft angle interval calculation volume with 1.

Being used for effectively finishing the Taylor series expansion of firing mass fraction is illustrated.As a rule, (1+x) ^mTaylor series are pressed following expansion:

${(1+x)}^m=\underset{n=0}{\overset{\&infin;}{\mathrm{\&Sigma;}}}\left(\begin{array}{c}m\\ n\end{array}\right)x^n=1+m\&CenterDot;x+\frac{m\&CenterDot;(m-1)}{2}\&CenterDot;x^2+...\mathrm{for\; all}\left|x\right|<1---\left(3\right)$

Based on above-mentioned formula, the x that has fired in the mass fraction situation is

And m is γ.

${(1+(-\frac{\mathrm{\&Delta;V}\left({\mathrm{\&theta;}}_i\right)}{V\left({\mathrm{\&theta;}}_i\right)}))}^{\mathrm{\&gamma;}}=\underset{n=0}{\overset{\&infin;}{\mathrm{\&Sigma;}}}\left(\begin{array}{c}\mathrm{\&gamma;}\\ n\end{array}\right){(-\frac{\mathrm{\&Delta;V}\left({\mathrm{\&theta;}}_i\right)}{V\left({\mathrm{\&theta;}}_i\right)})}^n=1-\mathrm{\&gamma;}\&CenterDot;\frac{\mathrm{\&Delta;V}\left({\mathrm{\&theta;}}_i\right)}{V\left({\mathrm{\&theta;}}_i\right)}+\frac{\mathrm{\&gamma;}\&CenterDot;(\mathrm{\&gamma;}-1)}{2}\&CenterDot;{\left(\frac{\mathrm{\&Delta;V}\left({\mathrm{\&theta;}}_i\right)}{V\left({\mathrm{\&theta;}}_i\right)}\right)}^2+...---\left(4\right)$

The approximate of exponential term determined by blocking sequence at second or the 3rd place of sequence, shown in equation 5 and equation 6.

${(1+(-\frac{\mathrm{\&Delta;V}\left({\mathrm{\&theta;}}_i\right)}{V\left({\mathrm{\&theta;}}_i\right)}))}^{\mathrm{\&gamma;}}\&ap;1-\mathrm{\&gamma;}\&CenterDot;\frac{\mathrm{\&Delta;V}\left({\mathrm{\&theta;}}_i\right)}{V\left({\mathrm{\&theta;}}_i\right)}---\left(5\right)$

Or

${(1+(-\frac{\mathrm{\&Delta;V}\left({\mathrm{\&theta;}}_i\right)}{V\left({\mathrm{\&theta;}}_i\right)}))}^{\mathrm{\&gamma;}}\&ap;1-\mathrm{\&gamma;}\&CenterDot;\frac{\mathrm{\&Delta;V}\left({\mathrm{\&theta;}}_i\right)}{V\left({\mathrm{\&theta;}}_i\right)}+\frac{\mathrm{\&gamma;}\&CenterDot;(\mathrm{\&gamma;}-1)}{2}\&CenterDot;{\left(\frac{\mathrm{\&Delta;V}\left({\mathrm{\&theta;}}_i\right)}{V\left({\mathrm{\&theta;}}_i\right)}\right)}^2---\left(6\right)$

With reference now to Fig. 3,, 50% the error of when equation 5 and equation 6 are used in the Rassweiler-Withrow formula in the equation 1, calculating of crank angle (CA50) when having burnt.In Fig. 3, because many one (two relative three Taylor expansions of Taylor expansion), validity is better as what expect when using equation 6.Yet being to use equation 5 still is that equation 6 all may depend on required computational efficiency and precision.If computing capability is limited, then can use equation 5.If be useful on the space of extra multiplication and subtraction, then can use equation 6 to obtain better precision.

Fig. 4 shows the CA50 error of being introduced by method of the present disclosure when γ gets its maximum value.

Refer now to Fig. 5, show the simplification Block Diagram of control module 14.As mentioned above, can there be many sensors to communicate by letter with control module 14.For simplicity, sensor input 102 is illustrated as a single box.Sensor input 102 is used for determining various intermediate values.Sensor 102 is provided to modular pressure 104, volume module 106, air fuel module 108, fuel injection amount module 110 and residual gas module 112.The intermediate value of determining in module 104-112 is sent to fuel mass mark module 120.Fuel mass mark module 120 can provide the fuel mass mark of a complete engine cycle.Engine parameter module 124 receives from the fuel mass fractional signal of fuel mass mark module 120 and in response to this SC sigmal control engine parameter.Engine parameter module 124 can be controlled various control functions, comprises the dilution control of air inlet.Dilution control can take place by opening exhaust gas recirculation valve shown in Figure 1 50, so that intake manifold 15 is arrived in exhaust gas recirculation.Having fired mass fraction also can be used for estimating because particular event institute torque transmitted when using together with other variable.

The pressure that modular pressure 104 is determined in the cylinder.Pressure in the cylinder can be determined by using manifold absolute pressure sensor 34.

Volume module 106 is determined volume based on crank position.Volume module 106 is determined volume according to the diverse location in circulation.Air fuel module 108 is determined the air fuel ratio signal in response to the different sensors input.Give an example, the waste gas lambda sensor can provide the indication about air fuel ratio.

Fuel injection amount module 110 can use different sensor inputs 102 in order to determine fuel injection amount.Fuel injection amount can be determined by the size for the pulse width of the control signal of the fuel injector of specific cylinder.

Residual gas module 112 can use the different measuring value in order to determine the residual gas in the cylinder.The residual gas module can utilize Abgassensor shown in Figure 1 56 to use carbon dioxide measured value, nitrogen oxide measured value, the hydrocarbon analysis of waste gas.

Should be noted in the discussion above that the specific calculation of carrying out in module 104 to 112 depends on the geometrical construction of engine type and motor and changes.

Referring now to Fig. 6, show the block schematic of firing mass fraction module 120.Fired each square in the mass fraction module 120 corresponding to the Rassweiler-Withrow formula of Fig. 1.In piece 130, determine the pressure of cylinder.Determine volume of cylinder in the piece 132.Determine volume-variation in the piece 134.Volume-variation representative in the piece 134 is from a change that calculates on the next volume that calculates.Gamma module 136 is determined the gamma in particular moment, in order to determine to have fired mass fraction.

The residual air capacity of determining to depend on mixture temperature, air fuel ratio and cylinder interior of gamma (γ).Therefore, because the chemical reaction of cylinder interior, γ value is different in each circulation not only, and each cycle period before the burning with also be different after burning.

Illustrate two kinds of optional methods that are used to obtain γ, one of them has two modification.

Referring now to Fig. 7, the variable γ of expression ratio of specific heat can use the multinomial (γ=f (x in the multinomial piece 150 of gamma module 136 ₁, x ₂, x ₃)) calculate.Input can be one or more in air quantity in the exhaust gas temperature, fuel injection amount, cylinder, Mass Air Flow reading, air fuel ratio, mainfold presure and the residual air capacity.In this multinomial, all these inputs are not necessary.Fundamentally, on behalf of the combination in any of the measured value of mixture temperature, air fuel ratio and residual air capacity, these can produce γ.

Referring now to Fig. 8, be used for to use two dimension to demarcate chart 66 in the another kind of replacing method that gamma module 136 ' is calculated γ.At Fig. 8, input 1, input 2 and to import 3 can be air quantity in the exhaust gas temperature, fuel injection amount, cylinder, Mass Air Flow reading, air fuel ratio, mainfold presure and residual air capacity.Two inputs that can be used as two-dimensional diagram 166 in the above parameter.Can use two input quantities and determine the chart output value from these two input quantities.Chart 166 can determine that described multiple calibration technique comprises that demarcation is followed the tracks of in test or the motor ergometer is demarcated by multiple calibration technique with experimental technique.Two in these variablees can provide a chart or plotted curve to be used for determining chart output.I.e. the 3rd input of chart output and another input, input 3 is provided to multiplication block 170.Input 3 can be one of air quantity, Mass Air Flow reading, air fuel ratio, mainfold presure and residual air capacity in three variable exhaust gas temperature, fuel injection amount, the cylinder.The value of electing input 3 as should not be the same value of one of two inputs at first as the input chart.Input 3 also can be multiply by specific factor or other constants.Fundamentally, the output of chart 166 and import 3 in multiplication block 170 by being taken advantage of together so that form gamma 172.

Referring now to Fig. 9, show the embodiment similar to embodiment shown in Figure 8, except the output of two-dimensional diagram 166 with import 3 and be provided to adder block 190, rather than multiplication block 170.

Referring now to Figure 10, illustrated the summary that is used for determining having fired the method for mass fraction.In step 210, receive each sensor input.As mentioned above, each sensor input can be provided by Fig. 1.In step 212, volume of cylinder is calculated or is stored in the control module.Utilize geometry to calculate the volume of cylinder that to determine under different crank angles.

In step 214, because the variation of the volume of cylinder that previous crank position causes also can use geography to determine to determine.In step 216, can determine cylinder pressure.As mentioned above, cylinder pressure can use input mainfold presure or other to determine.In step 218, can determine other intermediate value as shown in Figure 5.For example, air fuel ratio, fuel injection amount and residual gas can all be determined as described above.In step 220, gamma can be determined according to Fig. 7 aforesaid method in Fig. 9.In case determined gamma, in step 222, can determine the fuel mass mark.Fired mass fraction working pressure, volume and in Fig. 1 in the formula of Rassweiler-Withrow method and its Taylor series expansion as above gamma calculate.

Those skilled in the art in the invention will appreciate that according to foregoing description broad teachings of the present invention can implemented in many forms.Therefore, though the present invention includes specific embodiment, true scope of the present invention should not be restricted, because after research accompanying drawing, specification and claims, other distortion will be conspicuous to the those skilled in the art.

Claims (20)

1. method of controlling motor comprises:

By according to from the one or more combination in the group of the air quantity in exhaust gas temperature, fuel injection amount, the cylinder, Mass Air Flow, air fuel ratio, mainfold presure and residual air capacity, determine the expression of residual air capacity in mixture temperature, air fuel ratio and the cylinder, thereby determine ratio of specific heat.

Determine to have fired mass fraction according to volume of cylinder, mixture temperature, air fuel ratio and mainfold presure and ratio of specific heat; With

Based on firing mass fraction control engine parameter.

2. method according to claim 1 determines that wherein the expression of mixture temperature, air fuel ratio and residual air capacity comprises that three inputs in the use group form multinomial.

3. method according to claim 1 wherein comprises according to volume of cylinder, volume of cylinder variation, mixture temperature, air fuel ratio and air-distributor pressure and the definite mass fraction that fired of ratio of specific heat according to volume of cylinder, mixture temperature, air fuel ratio and mainfold presure and the definite mass fraction that fired of ratio of specific heat.

4. method according to claim 1 wherein comprises according to volume of cylinder, volume of cylinder variation, mixture temperature, air fuel ratio and cylinder pressure and the definite mass fraction that fired of ratio of specific heat according to volume of cylinder, mixture temperature, air fuel ratio and mainfold presure and the definite mass fraction that fired of ratio of specific heat.

5. method according to claim 1 is wherein controlled engine parameter and is comprised the control dilution.

6. method according to claim 1, wherein the control dilution comprises the control exhaust gas recirculation valve.

7. method according to claim 1 is wherein determined to have fired mass fraction and is comprised according to the definite mass fraction that fired of Taylor series expansion.

8. method of controlling motor comprises:

Form chart output and form modifying factor by two-dimensional diagram according to two inputs, described two inputs are selected from the group of air quantity, Mass Air Flow, air fuel ratio, mainfold presure and residual air capacity in the exhaust gas temperature, fuel injection amount, cylinder, and described modifying factor is selected from described group but not selects in order to form one of described two inputs of two-dimensional diagram;

Determine to have fired mass fraction according to volume of cylinder, chart output and modifying factor; With based on firing mass fraction control engine parameter.

9. method according to claim 8 is wherein determined to have fired mass fraction according to volume of cylinder, chart output and modifying factor and is comprised according to the definite mass fraction that fired of volume of cylinder, volume of cylinder variation, chart output and modifying factor.

10. method according to claim 8 is wherein determined to have fired mass fraction and is comprised chart output and modifying factor addition.

11. method according to claim 8 is wherein determined to have fired mass fraction and is comprised chart output and modifying factor are multiplied each other.

12. method according to claim 8 is wherein controlled engine parameter and is comprised the control dilution.

13. method according to claim 8, wherein the control dilution comprises the control exhaust gas recirculation valve.

14. method according to claim 8 is wherein determined to have fired mass fraction and is comprised according to the definite mass fraction that fired of Taylor series expansion.

15. a system comprises:

A plurality of engine sensors; With

Control module, this control module is determined ratio of specific heat according to the one or more combination in the group of air quantity, Mass Air Flow, air fuel ratio, mainfold presure and residual air capacity in the exhaust gas temperature of being determined by a plurality of engine sensors, fuel injection amount, the cylinder;

Described control module comprises that according to volume of cylinder and the definite mass fraction of the combustion module of having fired mass fraction of ratio of specific heat, described control module is based on firing mass fraction control engine parameter.

16. system according to claim 15, wherein said control module comprises the bidimensional chart that has according to the chart output of two inputs, described two inputs are selected from the group of air quantity, Mass Air Flow, air fuel ratio, mainfold presure and residual air capacity in exhaust gas temperature, fuel injection amount, the cylinder, described control unit forms modifying factor, and described modifying factor is selected from described group but not one of described two inputs of selecting from described group.

17. system according to claim 16, wherein the Calais determines ratio of specific heat to control module by exporting modifying factor and chart mutually.

18. system according to claim 16, wherein control module is by determining ratio of specific heat with modifying factor and chart output multiplication.

19. system according to claim 16, wherein control module is by at least two in the described group multinomials that form residual air capacity in expression mixture temperature, air fuel ratio and the cylinder.

20. system according to claim 16, the wherein dilution of control module control input gas.

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